Sony XPERIA P LT22i Working Instructions page 22

Replacement: Battery & Foil Battery Adhesive
Press along to make the two Foil Battery Adhesives securely
attached.
Place a new Battery in its proper position.
Press along to secure its attachment.
Make sure that the Gasket of the BtB connector is
securely attached as indicated by the pointer!
1262-6302 Rev 3
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Sony Mobile Communications AB – Company Internal
Working Instruction (mech)
22(89)